condition mean min max ZT0-3 18.8655 18.3029 19.4281 ZT4-7 10.86045 10.86045 10.86045 ZT8-11 17.12155 17.12155 17.12155 ZT12-15 0 0 0 ZT16-19 23.124200000000002 23.124200000000002 23.124200000000002 ZT20-23 16.4103 16.4103 16.4103